Evolve field spray, our newest enzyme technology that prevents and terminates a broader spectrum of odor molecules including human, smoke, gas, and other synthetic contaminant odors. It is the last line of defense against any alarming contaminant scent a hunter may acquire before and during the hunt. The 64oz bottle comes with an 12oz sprayer bottle (1303N). For best results, use the full ScentPrevent system of laundry, body and field products. Shake well before using.